Apparatus for treating foodstuffs



Aug. 25, 1931. 1". F. RATA|czAK 1,320,677

APPARATUS FOR TREATNG FOODSTUFFS I Filed Aug. 2o, 1926 Patented ug. 25,1931

UNITED STATES PATENT OFFICE THOMAS r. RATAICZAK, yor TROY, OHIO, AssIGNOR To THE HOBART MANUFACTURING COMPANY, or TROY, OHIO, A CORPORATION or' OHIO APPARATUS FR TREATING IEOQD'S'IUISIES v Application led .August 20, 1926. Serial No. 130,475.

In the drawings in whicl like characters of reference designatelike parts throughout the several views thereof,

Fig. 1 is a side elevation of a mixing Amachine constructed in accordance with this invention, having vcertain lparts broken away and in section to more clearly illustrate ythe construction thereof; and

Fig. 2 is a fragmentary vertical sectional view on an enlarged scale of the shaft and socket connection for` attaching the beater to the operating shaft of the mixing machine. l v 1 In the embodiment of the ,invention illus'- trated herein, a'mixing machine is shown comprising a base 10 carrying a standardll, upon which is mounted a bowl-supporting ring 12 carrying a suitable mixing bowl 13. Positioned at the upper end of the standard 11 is a casing 20, housing suitable gear transmission, driven by a motor 21. Rotatably mounted upon the portion of the casing which overhangs the bowlvis a rotaryfhead 22 which is driven by the motor through'the gear transmission. Rotatably mounted within a downward extension 23 of the headA 22 and also operatively connected Yto the gear transmission so as to, be .rotated thereby within the head 22 is a shaft 25 the lower end of which is formed to detachably receive a beater, stirrer or other tool, for .operating upon dough, or other material within the bowl. YThe construction and arrangement of these parts is such that a planetary m0- tion is imparted, the shaft 23 rotating onits own axis, and at the samey time moving bodilythrough. a circular path as the head 22 rotates. gearing for impartingv this motion to the driven shaft 25 from the driving motor 21 is not illustrated, as such mechanism is well vknownin thevart, and any suitable driving connections between the motor 21 and the driven shaft 25 may be used to impart mo- -t1on thereto.

v In the drawings the tool connected to the shaft is shown as a beater or stirrer such as is used for mixing dough for cake or bread making. This beater is indicated generally at 30, and may be of any suitable desired shape other than that shown, so long as it Lfits within the mixing bowl 13, and

upon operationv of the shaft 25 serves to rotate and revolve within the mixing bowl to effectively stirrup and mix the material contained therein. A machine of this character is adapted for utilizing a considerable number'of different types of beaters, mixers, or otherl food-treatingv instrumentalities,and the beater -which is shownin thefdrawngs isjused'rnerely to illustrate the invention.

lAll of these tools are arranged for readily detachable connection to the shaft 25. For effecting this connectionthe beater is provided with a socket which receives the endv ofthe shaft. This socket is providedk with abayonet groove, indicated in dotted lines bythe numeral 35. The shaft in turn is provided with a pin 36this construction being the usual bayonet connection. 'The pinv 36 is securely held in place by a screw 37 threadedly received within a bore 38 drilledin the end of the shaft 25. In assembling, the beater or the like, is moved to bring the en d of the shaft into the socket, with th'epin 36 in the axial part of the bayonet groove. The'beater is then given a part turn to bring the pin into the circumferential part -of the groove.

. f With a device of this character itis quite desirable thatthe socket and the shaft be so proportioned as to give a snug it. In actual .practice the socket is given approximately three thousandths (.003) of an inch clearance but with such small clearance the assembling ofy a beater or like tool in operative The driving mechanism and soY position would at times be a diilicult matter of manipulation, unless provisions were made for rendering this assembly easier. Particularly in the large view of F ig. 2, the provisions of this invention are clearly shown. As shown the socket in the hub of the beater is of two diameters, the lower part of which is designated generally by the numeral t0 being of substantially less diameter than the upper part which is designated by the numeral 41. In actual practice the upper part has a diameter of approximately one-eighth (l/St-h) inch more than the lower part. This diameter difference, although, of a substantial value, is relatively small in proportion to the socket bore, which is usually an inch or two in diameter. The shoulder 42 which divides the upper andy lower parts of the socket is beveled or inclined.

The end of the sha-ft is also of two diameters, the extreme end of the shaft which is designa-ted by the numeral 50 being of less diameter than the part of the shaft adjacent the reduced lower end. lso thel shoulder which connects the reduced portion of thel shaft 50 with thev adjacent portion ofi the shaft is beveled or i-nclined at substantially the same angle as the shoulder 42 asdesignated byA the numeral 522 The reduced portion ofthe shaft 50 is made of a diameter which accordsrwith the diameter of the narrower part L of the socket, therer being as said above, clearanceY of about three thou sandths inch provided. Also the diameter of the uri-reduced portion of! the shaft 25 which is adapted to cooperatewi-th the upper partA 41' oftheY socket` isVl correspondiingly proportioned with resp-ect" to thisirpper part of the socket. The free endof the reduced' portion 50t of the shaft isbeveledor tapered, as indicated at 531.4 l

The relative sizes ofthe various parte? of the socket and shaft connection are so co ordinated that an effective piloting and aligning action is obtained during assembly, and the shaft and socket axesare easily aligned. The different cylindricalportions of the shaftfandsocket. are qui-te lon relatively to ther comparatively,v srrra'lfl di rence in diameters so that when the smallerr diam eter shaft portion is insertedinl the larger diameter socket portion there is an` approxi'- mate aligment of the sha-ft and socket. axes. The length of the larger diameter socket por'- tion is nearly the same'as that of the smaller diameter shaft portion so that' a shaft portion cannot enter a socket portion ea eorresponding diameter very farbefore anl engagement andv centeringl actionA obtains along a beveled surface some distanceaway im an axial direct-ion. Preferably the arrange-i ment of the lengths of the bore'and shafts portions is such'- that one bevel engagement is effective just before the other bevelten gagement comes into play and one beveled end or shoulder of a shaft portion thus assists and cooperates with the beveled end or shoulder of the other shaft portion in effectively bringing the shaft and socket into Substantially perfect alignment. Thus, without much effort on the part of the operator, thek Shaft end is accurately piloted and centered so that the assembly of the shaft and socket may be completed and the driving conneoti'on with the pin may be easily made. Theparts when assembled therefore tit closel'y and all objectionable relative movement with its resultant noise and wear is prevented.

There` is a.L considerable distance as shown in Fig. 2 between the bottom of socket 4t() and'theendi of the shaft extension 50, as well as between thebeveled shoulders 42 and 52` when theA partsY are in their operative assembled positions` thus providing spaces at the ends of the: cylindrical portions for any foreign matter; The collection of dough incrustations or the like on articles of Jthis class is to be expected and the spaces 1nentioned: permit any foreign mattei' on the cylindrical shaft or socket portions to be wiped along the surfaces during the mounting of the beater and remain in` these spaces without preventing 'the shaft from entering the socketA to its full extent intended.

While the form of apparatus herein de scribed constitutes a preferred embodiment of the invention, it is to be understoody that the invention is not. limited to vthis precise form of'apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in thc appended claims.

What is claimed is:

l. In apparatusof the character described, two members to be joined in driving rela-- tionship, means for detachably connecting said members in driving relationship, stepped shaft portions on one of said members including outer and innerl cylindrical portions of different diameters, the other ofsaid members having stepped socket portions including outerl andinner cylindrical socket portions adapted to receive the said steppedfcylindrical shaft portionsv in a close fitting shaft and socket connection, spaced bevels on one of said members, one of said bevel'srbeing at the outer end of the stepped porti-ons ofthe said member and another of said bevels separating stepped portions thereof, the outer cylindrical shaft portion and the outer cylindrical socket portion being ofslightly unequal lengths whereby oney of said bevels contacts with the other member slightly inf advance of the Contact of a second bevel with the said other member, the said second! bevel contacting before a shaft portion is completely aligned within its cooperating socket. portion to provideV a 'successive piloting action of the said bevels on the joining of the said two members.

2. In apparatus of the character described, two members to be joined in driving relationship, means for detachably connecting said members in driving relationship, stepped shaft portions on one of said members including outer and inner cylindrical portions of diferentdiameters, the other of said vmembers having stepped socket portions including outer and inner cylindrical.

socket portions adapted to receivethe said stepped cylindrical shaft portions in a close fitting shaft and socket connection, s aced bevels on one of said members, one' o said bevels bein at the outer end of the stepped portions o the said member and another of said bevels separating stepped portions thereof, the outer cylindrical shaft portion and the outer cylindrical socket portion being of slightly unequal lengths whereby one of said bevels contacts withthe other member slightly in advance of the contact of a second bevel with the said other member, the said second bevel contacting before t a shaft portion is completely aligned within its cooperating socket portion to provide a successive piloting action of the said bevels on the joining of the said two members, the said socket portions being formed adjacent the end of each lstepped shaft portion when in socketed driving relationship therein lto provide material accumulating chambers for the reception of loose material and the prevention of binding upon assembly of the parts.

In testimony whereof Ik hereto affix my signature.

THOMAS F. RATAICZAK 

